Nitrogen-doped porous carbon derived from digested sludge for electrochemical reduction of carbon dioxide to formate

被引:29
作者
Qin, Zhiyi [1 ]
Jiang, Xiupeng [1 ,2 ]
Cao, Yue [3 ]
Dong, Shanshan [1 ]
Wang, Feng [1 ]
Feng, Leiyu [1 ,4 ]
Chen, Yinguang [1 ,4 ]
Guo, Yingqing [2 ]
机构
[1] Tongji Univ, Sch Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, 1239 Siping Rd, Shanghai 200092, Peoples R China
[2] Changzhou Univ, Sch Environm & Safety Engn, 1 Gehu Rd, Changzhou 214500, Jiangsu, Peoples R China
[3] Shanghai Jianling Construct Consulting Co Ltd, 75 South Wanping Rd, Shanghai 200031, Peoples R China
[4] Shanghai Inst Pollut Control & Ecol Secur, 1239 Siping Rd, Shanghai 200092, Peoples R China
基金
中国国家自然科学基金;
关键词
Carbon dioxide; Electrochemical reduction; Formate; Nitrogen-doped porous carbon; Digested sludge; CO2; REDUCTION; ACTIVE-SITES; FORMIC-ACID; EFFICIENT; CATALYSTS; OXYGEN; ELECTROREDUCTION; HYDROGENATION; NANOPARTICLES; NANOTUBES;
D O I
10.1016/j.scitotenv.2020.143575
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Carbon-based materials have been applied as cost-effective electrocatalysts to reduce carbon dioxide (CO2) into valuable chemicals. Here, an environment-friendly method is proposed to obtain nitrogen-doped porous carbons (NPCs) from digested sludge, which is an abundant waste product from sewage treatment plants. The materials were used as a metal-free electrocatalyst for electrochemical reduction of CO2 to formate. The synthesized material (NPC-600) had a mesoporous and microporous structure with a specific surface area of 246.21 m(2) g(-1) and pore volume of 0.494 cm(3) g(-1). Active sites based on nitrogen atoms accounted for 2.98 atom% of the content and included pyrrolic-, pyridinic-, and graphitic-N, which is useful for CO2 adsorption and electron transfer in electrochemical reduction. The Faradaic efficiency for formate production from CO2 in the presence of NPC-600 was 68% at the potential of -1.5 V vs. SCE. Tafel analysis indicated that the pathway of CO2 conversion involved the reduction of CO2 to CO2*- intermediate, which was then converted to HCOO*- and finally formate. (C) 2020 Published by Elsevier B.V.
引用
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页数:8
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